RE: I AM NOT A HAPPY CAMPER :(
That's some Grade-A, high-class bullshit from the park office.
What would happen if you just closed up the trailer, shut off or do vacation mode on the mechanicals - and just get on with things? At least you could start investing your time, if not the money (which you're spending anyway).
It sounds to me like the park thinks they have you over a barrel, but they can't make you physically stay there. I doubt they want a vacant-looking unit, so maybe it will be a spur to cooperate.
Otherwise, I'm thinking it might be time for an attorney. That's some shady shit they're pulling.
Good luck, bud!